how to save data from one constant to another constant with dropdown and pm?

Hello, I have a question, I have an interface which is a grid, this allows me to add a dropdown with information obtained from a constant, this constant has 3 groups, my question is, how can I do so that when I add a new grid, this information from my constant is independent of my dropdown that makes new, all this is written to another constant through a process. I have something like this, I already tried using save to to my new constant, but it is not updated with the process, does not elminate or anything. this is my code.

thanks you!

a!localVariables(
/*rule to save groups */
local!groups: rule!GS1_getgroupnames(),
/*rule to get all groups */
local!grupos: rule!GS1_getgroups(),
a!formLayout(
label: "Manage Additional Distribution List",
instructions: "Please select and modify the groups that you wish to update in the grid below.",
contents: {
a!sectionLayout(
label: "Additional Distribution List",
contents: {
a!gridLayout(
label: "",
labelPosition: "ABOVE",
headerCells: {
a!gridLayoutHeaderCell(label: "Email"),
a!gridLayoutHeaderCell(label: " ")
},
columnConfigs: {
a!gridLayoutColumnConfig(width: "DISTRIBUTE", weight: 3),
a!gridLayoutColumnConfig(width: "ICON")
},
rows: {
a!forEach(
items: local!grupos,
expression: a!gridRowLayout(
contents: {
a!dropdownField(
label: "Dropdown",
labelPosition: "ABOVE",
placeholder: "--- GROUP LISTS ---",
choiceLabels: rule!GS1_getgroups(),
choiceValues: rule!GS1_getgroups(),
value: fv!item,
saveInto: fv!item,
searchDisplay: "AUTO",
validations: {}
),
a!richTextDisplayField(
value: a!richTextIcon(
icon: "close",
altText: "delete " & fv!index,
caption: "Remove " & fv!item,
link: a!dynamicLink(
value: fv!index,
saveInto: {
a!save(
local!grupos,
remove(local!grupos, save!value)
)
}
),
linkStyle: "STANDALONE",
color: "NEGATIVE"
)
)
}
)
)
},
selectionSaveInto: {},
selectionDisabled: false,
addRowlink: a!dynamicLink(
label: "Add Email",
saveInto: {
a!save(
local!grupos,
append(local!grupos, save!value)
)
}
),
validations: {},
shadeAlternateRows: true,
borderStyle: "LIGHT"
)
}
)
},
buttons: a!buttonLayout(
primaryButtons: {
a!buttonWidget(
label: "Save",
saveInto: {
a!save(ri!groups, local!grupos),
a!save(ri!constants, "GROUPS")
},
submit: true,
style: "PRIMARY"
)
},
secondaryButtons: {
a!buttonWidget(
label: "Close",
value: 1,
submit: true,
saveInto: { ri!cancel },
validate: false,
style: "NORMAL"
)
}
)
)
)